Those seem like two different problems with two different solutions. For ex: solving the environmental issues for the smaller subset and better correlating grades with actual outcomes in education for everyone. Especially if it risks masking problems and may ultimately harm more than it helps.
OTOH metrics and objective standards are definitely worthwhile indicators. Agreed. In fact, in the modern age of data I think we ought to look at more things to see if there is a latent pattern positive or negative. Reading and math scores are not enough. I want to see physical fitness data. I want to know how many words per minute kids can type. How many dental cavities do they have. Can they pass a civics quiz on state or federal government. Do they know basic geography and have some literacy about the world.
Incentives need to be based on obtainable goals and targeted improvements. Payouts (bribes!) to students for good grades and scores actually really work. Money helps kids internalize the societal value placed on their performance. Similarly, targeted bonuses for teachers work too, but only if formulated relative to the characteristics of enrolled students. See the literature by R. Fryer, for example